Fix visionOS capitalization on the Profile page

[cgoldsby]

📝 Why & how

According to Apple's developer guidelines, "visionOS" should not be capitalized; it always starts with a lowercase "v", even at the beginning of a sentence.

I apologize; it was I who initially capitalized visionOS. Today, I learned that is not correct. 🙇

Reference:
Submit your apps to the App Store for Apple Vision Pro / Describe your app

visionOS: visionOS begins with a lowercase v, even when it’s the first word in a sentence.

✅ Checklist

• visionOS capitalization is correct on the Profile page

To test:

gh repo clone react-native-community-directory
git checkout visionOSCapitalizationFix
yarn && yarn start